3 4 Inch Plywood For Tile Floor Substrate

Thin set was used instead of glue or adhesive.

3 4 inch plywood for tile floor substrate.

Use 5 8 inch thick exterior grade plywood placed with the smooth side up and the top grain perpendicular to the floor framing. Now largely regarded as the very best underlayment for ceramic tile in any application floors walls and countertops cement based backer board goes by many names. Backer board panels typically measure 3 feet by 5 feet and can be trimmed as needed. Now the entire flooring of ceramic tiles needs to be torn out and replaced.

Leave a gap of 1 8 inch between sheets for thin set mortar or tile. The floor tiles became loose cracked and ugly looking over about 2 decades of use. We are thinking about having the 3 8th inch plywood torn out and replaced by 1 4 inch concrete board before the new tiles are installed. Most prefer a minimum thickness of at least 1 1 4 inch such a inch t g subfloor with inch plywood underlayment.

For many years the standard option was lauan plywood also called philippine mahogany or luan plywood which is made with an inexpensive tropical hardwood and therein lies its problem. Tile installed over wood floor systems must have a minimum of 1 1 4 inches of solid material beneath it. This means you can have a 3 4 inch wood subfloor covered by 1 2 inch plywood cement board or approved gypsum fiber underlayment. The average thickness of plywood sheets used for backer on counter tops is 3 4 inch.

It typically comes in 4 x 8 foot sheets. It is generically called cement board or backer board or it can also be referred to by one of the common brand names such as densshield hardiebacker and wonderboard. Continue this process to lay the rest of your backer board panels leaving a 1 4 inch gap at the walls. Use 16d common nails to create a gap of 1 8 inch between the sheets.

Most plywood underlayment is about 1 4 inch thick and has square edges and a smooth knot free top face. Uncoupling membranes aren t recommended for tiles smaller than 2 inches square and should not be used when covering old hardwood flooring due to adhesion problems. To cut backer board measure and mark the size you need. A 3 4 inch plywood subfloor on a joist structure with 24 inch spacing needs the extra thickness of cementboard or the floor will flex and the tiles will crack.

Cement based backer board. This provides adequate support for a wide range of finish materials. The builder hired used 3 4 osb for the flooring while the tile contractor used a 1 4 cbu under the tile thus achieving 1 in total depth. The bare minimum recommended by most tile setters is a total subfloor thickness of 1 1 8 inch.